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Re: [RFC][4.4] PR rtl-optimization/3507 appalling optimization with sub/cmp
On Wed, Nov 28, 2007 at 11:15:25PM +0000, Joseph S. Myers wrote:
> On Wed, 28 Nov 2007, Joseph S. Myers wrote:
>
> > I'm not clear what you want said about floating-point issues (something
> > for a comment in the code about why it must be integer-only?), but for
> > example inf == inf but inf - inf == NaN.
>
> Correction: inf == inf is true, while inf - inf has the value NaN (not 0)
> but "inf - inf == NaN" is false because NaN != NaN.
Yes, exactly that sort of problems.
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Rask Ingemann Lambertsen
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